Diving is possible year-round; hurricane season runs from July to November. The rainy season lasts from May to October and the dry season is typically from November to April. Water temperature averages 26-28C/79-82F in winter and 27-29C/81-84F in summer. Underwater visibility averages around 30m/100ft.
What to see
Among marine species divers can spot manta rays, large sailfish, groupers, toadfish, tang fish, trigger, schools of jack, moray eels, grunts, stingrays, parrotfish, Hawksbill turtles, octopus, angelfish, nurse sharks, whale sharks, barracudas, snappers and many more. The whale shark season is from late May to mid September. Bull shark season is from November to March. Cenotes are sinkhole-like cave formations where divers can dive through caverns with amazing stalactites, stalagmites and marine fossils, with a visibility of 150ft/50m, and where even the halocline or freshwater/saltwater interface is visible.